/*
** Truncate a crash-file.
*/
static int cfTruncate(sqlite3_file *pFile, sqlite_int64 size){
CrashFile *pCrash = (CrashFile *)pFile;
assert(size>=0);
if( pCrash->iSize>size ){
pCrash->iSize = size;
}
return writeListAppend(pFile, size, 0, 0);
}
static int cfFileControl(sqlite3_file *pFile, int op, void *pArg){
if( op==SQLITE_FCNTL_SIZE_HINT ){
CrashFile *pCrash = (CrashFile *)pFile;
i64 nByte = *(i64 *)pArg;
if( nByte>pCrash->iSize ){
if( SQLITE_OK==writeListAppend(pFile, nByte, 0, 0) ){
pCrash->iSize = (int)nByte;
}
}
return SQLITE_OK;
}
return sqlite3OsFileControl(((CrashFile *)pFile)->pRealFile, op, pArg);
}
/*
** Write data to a crash-file.
*/
static int cfWrite(
sqlite3_file *pFile,
const void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
CrashFile *pCrash = (CrashFile *)pFile;
if( iAmt+iOfst>pCrash->iSize ){
pCrash->iSize = iAmt+iOfst;
}
while( pCrash->iSize>pCrash->nData ){
u8 *zNew;
int nNew = (pCrash->nData*2) + 4096;
zNew = sqlite3_realloc(pCrash->zData, nNew);
if( !zNew ){
return SQLITE_NOMEM;
}
memset(&zNew[pCrash->nData], 0, nNew-pCrash->nData);
pCrash->nData = nNew;
pCrash->zData = zNew;
}
memcpy(&pCrash->zData[iOfst], zBuf, iAmt);
return writeListAppend(pFile, iOfst, zBuf, iAmt);
}